 A visual band light curve for HO Telescopii, adapted from Sürgit et al. (2017) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19 51 58.93159 |
| Declination | −46° 51′ 42.4354″ |
| Apparent magnitude (V) | 8.22 (Max) |
| Characteristics | |
| Spectral type | A7III(m) |
| Variable type | Algol |
| Astrometry | |
| Radial velocity (Rv) | −5.91±0.09 km/s |
| Proper motion (μ) | RA: +1.814 mas/yr Dec.: −33.369 mas/yr |
| Parallax (π) | 3.5831 ± 0.0796 mas |
| Distance | 910 ± 20 ly (279 ± 6 pc) |
| Orbit | |
| Period (P) | 1.613097 d |
| Semi-major axis (a) | ≥0.019±0.0001 AU |
| Eccentricity (e) | 0.00 |
| Inclination (i) | 82.7±0.5° |
| Periastron epoch (T) | 2,451,875.06581±0.00027 HJD |
| Semi-amplitude (K1) (primary) | 131.11±0.18 km/s |
| Semi-amplitude (K2) (secondary) | 142.35±0.18 km/s |
| Details | |
| A | |
| Mass | 1.88±0.04 M☉ |
| Radius | 2.28±0.15 R☉ |
| Age | 1.1 Gyr |
| B | |
| Mass | 1.73±0.04 M☉ |
| Radius | 2.08±0.16 R☉ |
| Other designations | |
| HO Tel, CD−47°13121, HD 187418, HIP 97756, SAO 229902 | |
| Database references | |
| SIMBAD | data |
HO Telescopii is an eclipsing binary star system located in the southern constellation of Telescopium. The maximum apparent visual magnitude of 8.22 is too faint to be visible to the naked eye. The system is located at a distance of approximately 910 light years based on parallax. The combined stellar classification of the system is A7III(m), matching an evolved A-type star that is possibly metallic-lined. The system is around 1.1 billion years old and consists of two stars of similar mass and size.
The variability of this system was discovered by W. Strohmeier, R. Knigge, and H. Ott in 1965. It is a detached binary system with both components filling three-fourths of their respective Roche lobes. Their orbital period is 1.613097 days with a circularized orbit, and the orbital plane is inclined by 83° to the line of sight from the Earth; close to edge-on. As a consequence, they form an Algol-like eclipsing binary with a magnitude decrease of 0.51 during the primary eclipse and 0.45 during the secondary eclipse.
References
- ^ Sürgit, D.; et al. (July 2017). "Absolute parameters of detached binaries in the southern sky - III: HO Tel". New Astronomy. 54: 109–114. Bibcode:2017NewA...54..109S. doi:10.1016/j.newast.2017.01.013.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Avvakumova, E. A.; et al. (October 2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten. 334 (8): 860. Bibcode:2013AN....334..860A. doi:10.1002/asna.201311942. hdl:10995/27061.
- ^ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
- ^ Sürgit, D.; et al. (July 2015). Rucinski, Slavek M.; Torres, Guillermo; Zejda, Miloslav (eds.). "First Spectroscopic Solutions of Two Southern Eclipsing Binaries: HO Tel and QY Tel". Living Together: Planets, Host Stars and Binaries, Proceedings of a conference held 8-12 September 2014 in Litomyšl, Czech Republic. ASP Conference Series. 496. San Francisco: Astronomical Society of the Pacific: 258. Bibcode:2015ASPC..496..258S.
- ^ Khaliullin, Kh. F.; Khaliullina, A. I. (January 2010). "Synchronization and circularization in early-type binaries on main sequence". Monthly Notices of the Royal Astronomical Society. 401 (1): 257–274. Bibcode:2010MNRAS.401..257K. doi:10.1111/j.1365-2966.2009.15630.x.
- ^ Grygar, J.; Horak, T. B. (1980). "Orbital Elements of the Eclipsing Binaries RW CrA and HO Tel from Multicolour Light Curves". Bulletin of the Astronomical Institute of Czechoslovakia. 31: 297. Bibcode:1980BAICz..31..297G.
- "HO Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-12.
- Spoelstra, T. A. Th.; Van Houten, C. J. (1972). "Five-colour photometry of the eclipsing binary HO Telescopii". Astronomy and Astrophysics Supplement. 7: 83. Bibcode:1972A&AS....7...83S.
- Sistero, R. F.; Candellero, B. A. (August 1979). "HO Telescopii: Light Elements". Information Bulletin on Variable Stars. 1666: 1. Bibcode:1979IBVS.1666....1S.
- Strohmeier, W.; et al. (February 1965). "Bright Southern BV-Stars". Information Bulletin on Variable Stars. 81: 1. Bibcode:1965IBVS...81....1S.
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